@CappuccinoDavid - if you haven't  found anything else yet go to:  giveawayoftheday.com  where you can download this pay-for prog for free for the next 6 hours still.

BUT... make sure you  click on the comments section at the download page first to read what people write about memory optimizers in general.

General consensus seems to be: restart your computer to cleanse your RAM and if you have mem problems the best solution is buy more RAM.

In a rebuttal  someone makes a point, it seems to me, re leaking mem from alredy closed progs which refuse to release it. (culprits cited such as MS Word, Excell, Adobe Reader)

Even if you're too late now or don't want to get this prog  other freeware alternatives are listed therein along with some informative opinions.